Interzonal airflow rates for use in near-field far-field workplace concentration modeling.
Interzonal air flow rates (β) for a workspace above a table were measured in 12 indoor air spaces using an experimental apparatus simulating a vapor release into an occupied near zone. The near field was modeled as a 0.32 m3rectangular cube volume 0.60 m high above the 0.60 m × 0.90 m table. A total...
| Publicado en: | Journal of Occupational & Environmental Hygiene Vol. 14; no. 10; pp. 793 - 801 |
|---|---|
| Autores principales: | , |
| Formato: | equations & formulas pictorial research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Oct2017
|
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=125724099&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 125724099 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15459624 V1L jtl: Journal of Occupational & Environmental Hygiene issn: 15459624 maglogo: Y pubinfo: dt: Oct2017 vid: 14 iid: 10 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 125724099 125724099 125724099 10.1080/15459624.2017.1334903 125724099 ppf: 793 ppct: 8 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Interzonal airflow rates for use in near-field far-field workplace concentration modeling. aug: au: Keil, Chris Zhao, Yuxi affil: Department of Geology and Environmental Science, Wheaton College, WheatonIllinois sug: subj: Environment, Controlled Work Environment Correlation Coefficient Effect Size Simulations Solvents Environmental Exposure ab: Interzonal air flow rates (β) for a workspace above a table were measured in 12 indoor air spaces using an experimental apparatus simulating a vapor release into an occupied near zone. The near field was modeled as a 0.32 m3rectangular cube volume 0.60 m high above the 0.60 m × 0.90 m table. A total of 74 experimental measurements of β were made. The apparatus consisted of photoionization detectors measuring concentrations of acetone around an evaporating liquid surface with a robot arm simulating worker motion in the near field. The vapor release rate and the resulting concentrations were used in a near-field far-field (NF-FF) model to calculate β. Measures of mixing within the near-field supported the assumption of the NF-FF model that the near field is well-mixed. Measured values of β ranged from 0.4–19 m3/min with an average of 4.8 m3/min. This corresponds to 1.2–59 air changes per minute in the near field and an average of 15 air changes per minute. The values of β were log normally distributed with a geometric mean of 3.4 m3/min and a geometric standard deviation of 2.3. The 95% confidence interval on the geometric mean of β was 2.8–4.2 m3/min. The product of the random air speed in the room and one half of the near-field free surface area was shown to be a good method of determining β. There was a slight correlation seen between room volume and β, but the effect size was small. Room air change rate was not found to be correlated with β. The observed distribution of β will be helpful in selecting values for interzonal airflow rate in NF-FF modeling of worker exposures. pubtype: Academic Journal doctype: equations & formulas pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
|---|